dàn fán / nǐ / tí qián / gào sù / wǒ / yì shēng / wǒ / jiù / néng / bāng / nǐ / ān pái / shí jiān

但凡你提前告诉我一声，我就能帮你安排时间。

If only you had told me in advance, I could have helped arrange the schedule.